This is my first post on the wine side of things, I do beer not wine. Anyway, I have a Thompson vine in my back yard and this year I got over 50lbs of grapes from it... and I wasn't even taking any care of it! My SWMBO joked about making wine with it. We didn't but it did get me thinking. I imagine there's a reason why these grapes aren't commonly used for wine but, can anyone tell me why?